volume | PIER Journals

Abstract

In recent years, Computer Aided Design (CAD) based on Artificial Neural Networks (ANNs) have been introduced for microwave modeling, simulation and optimization. In this paper, the characteristic parameters of edge coupled and conductor-backed edge coupled Coplanar Waveguides have been determined with the use of ANN model. Eight learning algorithms, Levenberg-Marquart (LM), Bayesian Regularization (BR), Quasi-Newton (QN), Scaled Conjugate Gradient (SCG), Conjugate Gradient of Fletcher-Powell (CGF), Resilient Propagation (RP), Conjugate Gradient back- propagation with Polak-Ribiere (CGP) and Gradient Descent (GD) are used to train the Multi- Layer Perceptron Neural Networks (MLPNNs). The results of neural models presented in this paper are compared with the results of Conformal Mapping Technique (CMT). The neural results are in very good agreement with the CMT results. When the performances of neural models are compared with each other, the best results are obtained from the neural networks trained by LM and BR algorithms.

1. Houdart, M., "Coplanar lines: Application to broadband microwave circuits," Proceedings of 6th Europe Microwave Conference, 49-53, 1976.
doi:10.1109/EUMA.1976.332244

2. Gupta, K. C., G. R. Bahl, and I. J. Bhartia, Microstrip Lines and Slotlines, Artech House, 1996.

3. Salivahanan, S. and R. Ramesh, "CAD models for coplanar waveguide synthesis using artificial neural network," IETE Technical Review, No. 8, 123-129, Jun. 2001.

4. Ghione, G. and C. Naldi, "Coplanar waveguides for MMIC applications: Effects of upper shielding, conductor backing, finiteextent ground planes, and line-to-line coupling," IEEE Trans. Microwave Theory Tech., Vol. 35, No. 3, 260-267, 1987.
doi:10.1109/TMTT.1987.1133637

5. Liao, C.-L. and C. H. Chen, "Quasi-static and full wave analyses of conductor-backed edge-coupled coplanar waveguide," IEEE Proceedings of APMC 2001 Conference, 181-183, Taipei, Taiwan, 2001.

6. Wheeler, H. A., "Transmission-line properties of parallel strips separated by a dielectric sheet," IEEE Trans. Microwave Theory Tech., Vol. 13, 172-185, 1965.
doi:10.1109/TMTT.1965.1125962

7. Veyres, C. and V. F. Hanna, "Extension of the application of conformal mapping techniques to coplanar lines with finite dimensions," International Journal Electronics, Vol. 48, 47-56, 1980.
doi:10.1080/00207218008901066

8. Knorr, J. B. and K. D. Kuchler, "Analysis of coupled slots and coplanar strips on dielectric substrate," IEEE Trans. Microwave Theory Tech., Vol. 23, No. 7, 541-548, 1975.
doi:10.1109/TMTT.1975.1128624

9. Ghione, G. and C. Naldi, "Analytical formula for coplanar lines in hybrid and (monolithic) MICs," Electron. Letters, Vol. 20, 179-181, 1984.
doi:10.1049/el:19840120

10. Hammerstad, E. O., "Equations for microstrip circuit design," Proceedings 5th European Microwave Conference, 268-272, Germany, 1975.

11. Thiruvalar Selvan, P., S. Raghavan, and S. Suganthi, "A CAD approach based on artificial neural networks for conductor-backed edge coupled coplanar waveguides," IEEE Proceedings of APMC 2008 International Conference, 1-4, Hong Kong, China, 2008.

12. Simons, R. N., Coplanar Waveguide Circuits, Components and Systems, Wiley Inter Science, 2001.
doi:10.1002/0471224758.ch1

13. Zhang, Q. J., K. C. Gupta, and V. K. Devabhaktuni, "Artificial neural networks for RF and microwave design --- From theory to practice," IEEE Trans., Vol. 51, 1339-1349, 2003.

14. Zhang, Q. J. and K. C. Gupta, Neural Networks for RF and Microwave Design, Artech House, 2000.

15. Yildiz, C. and M. Turkmen, "Quasi-static models based on arti¯cial neural networks for calculating the characteristic parameters of multilayer cylindrical coplanar waveguide and strip line," Progress In Electromagnetics Research B, No. 3, 1-22, 2008.
doi:10.2528/PIERB07112806

16. Kaya, S., M. Turkmen, K. Guney, C. Yildiz, and , "Neural models for the elliptic- and circular-shaped microshield lines," Progress In Electromagnetics Research B, Vol. 6, 169-181, 2008.
doi:10.2528/PIERB08031216

17. Yildiz, C., K. Guney, M. Turkmen, and S. Kaya, "Neural models for coplanar strip line synthesis," Progress In Electromagnetics Research, Vol. 69, 127-144, 2007.
doi:10.2528/PIER06120802

18. Patnaik, A. and R. K. Mishra, "ANN techniques in microwave engineering," IEEE International Conference on Microwave, 55-60, Mar. 2000.
doi:10.1109/6668.823828

19. Fun, M.-H. and M. T. Hagan, Levenberg-marquardt training for modular networks , 468-473, Proceedings of the 1996 International Joint Conference on Neural Networks, 1996.

20. Levenberg, K., "A method for the solution of certain nonlinear problems in least squares," Quarterly of Applied Mathematics, Vol. 11, 431-441, 1963.

21. Mackay, D. J. C., "Bayesian interpolation," Neural Computation, Vol. 3, No. 4, 415-447, 1992.
doi:10.1162/neco.1992.4.3.415

Dr. P. Thiruvalar Selvan

Dr. Singaravelu Raghavan